There are, but the Cave + Caroline connection is the most credible, and certainly is implied at the end. One theory I've seen (but don't subscribe to) is that Chell is a clone. But it doesn't fit with the fact that you can find a display signed "Chell" at the "Bring Your Daughter to Work Day" exhibit. One other possibility is that Doug Rattmann is Chell's adoptive parent (and this still keeps the Cave + Caroline relationship in play).

that theory is not possible. Cave died a long time ago. and caroline was forced into a computer

Of course it is possible. After checking two sources (Half-Life Wiki & Steam forums) it is possible that Chell was born between 1975 and 1980. According to both sources, Cave died sometime in the mid-to-late 1980s. Both sources also claim that Caroline was integrated into GlaDOS sometime after 1990. BYDtWD (and the neurotoxin) occurs sometime in the early 2000s, and Chell is placed in stasis at some point. Chell is out of stasis a little after, perhaps 2010ish.

its all theories in what times they died. if you notice how deep aperture is... it'd take a few years to build that far up again, on top of that, your argument is entirely based on random people guessing

So... That theory assumes Cave and Caroline were the only humans breeding in the '70s?

no, what i thought is that chell was in cryogenic (or however it's spelled) storage for a good chunk of time, and there were other test subjects (possible aperture employees or their children?) in there too, but glados killed all of them. and then, everything with chell happened. there is a lot of direct evidence of chell being an aperture employee's child

its all theories in what times they died. if you notice how deep aperture is... it'd take a few years to build that far up again, on top of that, your argument is entirely based on random people guessing

not entirely, there was a part where the audio recording was cave coughing and he was talking about if he died, he wanted caroline to take over

there is a lot of direct evidence of chell being an aperture employee's child

Yes, but why does she have to be Cave&Caroline's? Just because they're part of the storyline?Why would they cryogenize their child?

I think it's like the companion cube theory; it is crazy, but there's no evidence that contradict the theory and people just roll with it.

well, there was the chell signature on the bring your daughter to work day project. and most people say that cave made one of the aperture employees (doug rattman) adopt chell. also, what is the companion cube theory?

Rattmann is not Chell's father in any way. Adopted? You honestly think a schizophrenic man would ever be allowed to do that? Listen to the Cara Mia song on youtube with the translated lyrics added. It's pretty clear.

Rattmann is not Chell's father in any way. Adopted? You honestly think a schizophrenic man would ever be allowed to do that? Listen to the Cara Mia song on youtube with the translated lyrics added. It's pretty clear.

didnt he develop schizophrenia during his testing? and yes, i have seen the english lyrics before. many people think cave forced one of the employees to adopt chell after she was born, its not necessarily him but it could be.